ML20009F528
| ML20009F528 | |
| Person / Time | |
|---|---|
| Site: | Mcguire |
| Issue date: | 05/08/1981 |
| From: | Parker W DUKE POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8107310270 | |
| Download: ML20009F528 (2) | |
Text
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422 SouTa Cnuncu SrazzT, CuAnt.ortz, N. C. asa4a si ny 11 A3 10 w a LLI AM O. PA R K ER. J R.
Vect Patseormt TELEPuoN E:AmEA 704 Stram Paooucticm 373-4083 TI ooS OV May 8, 1981 p \\.
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Mr. James P. O'Reilly, Director N
U. S. Nuclear Regulatory Comission 6) j g ',' 01981 - [a Region II Z
101 Marietta Street, Suite 3100
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Atlanta, Georgia 30303 D
Re: McGuire Nuclear Station O
D" Units 1 and 2 7
4 Docket No. 50-370
Dear Mr. O'Reilly:
Pursuant to 10CFR 50.55e please find attached Significant Deficiency Report SD 370/81-02 Very truly yours,
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William O. Parker, Jr.
RWO:pw Attachment cc: Director M. J. Graham Office of Inspection and Enforcement Resident Inspector U.S. Nuclear Regulatory Commission NcGuire Nuclear Station Washington, D.C.
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McGUIRE NUCLEAR STATION Report Number: SD-370/81-02 Report Date: May 1, 1981 Facility: McGuire Nuclear. Station, Unit 2, Duke Power Company Identification of Deficiency:
Containmant Purge System ductwork inside containment does not comply with thickness criteria set forth in the McGuire FSAR. This deficiency was identified by Duke Power personnel on March 30, 1981.
Initial Report: On April. 8,1981, Mr. Art Johnson of the Region II office was notified of the deficiency by H. A. Smith, J. L. Richardson and W. O. Henry of Duke Power Company, Charlotte, North Carolina.
Description of Deficiency:
In response to FSAR N ation 42.63, Duke Power Company stated that. certain sections. of. containment purge system ductwork would be fabricated from 10 gauge material. These heavy-wall. sections were to prevent containment isolation. valve closure failure in the event of a design basis LOCA while purging operation.was in process.
It was verified that the design documents required minirann 16 gauge, and that the actual installa tion. was oE.16. gauge. The discrepancy was docu-mented within Duke Power Company asca.nonconformanca with.the FSAR. commit-ment.
Analyses were performed to. determine the adequacy of the-actual installation under conditions-of a design basis LOCA concurrent. with purge system operation. The situation. is being-evaluated for applicability ta other Duke units.
Analysis of Safety Implication: The purpose of the heavy wall duce sections.
is to preclude purge system duct. damage during LOCA from interfering with the associated containment isolation ~ valve? s abilit.y to close. With these conditions present, duct failure and subsequent valve closure failure could have resulted in a greater release of radioactivity. Since the system operation is limited by Technical Specifications to 90 hours0.00104 days <br />0.025 hours <br />1.488095e-4 weeks <br />3.4245e-5 months <br /> per year when
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the unit is above cold Shutdown, the probability of a simultaneous design basis LOCA and purge system operation is exceedingly small.
Corrective Action:
Design documents have been updated.to. incorporate the l
requirement for 10 gauge ductwork. The actual installation will be cor-rected prior to system turnover to the operating personnel (scheduled for August 1, 1981). Follow-up activities pertaining to other Duke Power i
Company units will continue.
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